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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>casc</b> -   cascade realization of filter from coefficients</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[cels]=casc(x,z)  </tt>
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    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>x</b>
        </tt>: (4xN)-matrix where each column is a cascade element, the first two column entries being the numerator coefficients and the second two column entries being the denominator coefficients</li>
      <li>
        <tt>
          <b>z</b>
        </tt>: string representing the cascade variable</li>
      <li>
        <tt>
          <b>cels</b>
        </tt>: resulting cascade representation</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Creates cascade realization of filter from a matrix of coefficients
    (utility function).</p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>

x=[1,2,3;4,5,6;7,8,9;10,11,12]
cels=casc(x,'z')
 
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